01-Reshape-Data.Rmd ex13-solution y=total instead of y=n

```{r ex13-solution}
babynames %>%
  group_by(year, sex) %>% 
  summarise(total = sum(n)) %>% 
  ggplot() +
    geom_line(aes(x= year, y= total, color = sex)) #total = sum(n)
```